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Tanzanite

Since the discovery in the sixties the Tanzanite popularity have constnat rised. The clear blue-violet colour and wonderful luster most certanly have contributed to the success, as well as the limited access due to Tanzanias' export restrictions In our stock we have faceted small round and marquise cut gemstones suitable for earrings eller combined settings. (Sorry about the poor picture quality.)

 

Size: 3,10x3,10 mm, 5x2,5x1,4 mm

Clarity: VVS

Origin: Tanzania

Treatment: Heated

In stock:  ca 6 of each cut

 

Price: USD 16.20 a piece

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Tanzanit, named by Tiffany & Co., is the blue/violet variety of the mineral Zoisite. It was discovered by Manuel de Souza, a tailor and part-time gold prospector living in Arusha, in the Mererani Hills of Manyara Region in Northern Tanzania in 1967, near Mount Kilimanjaro. He assumed that the mineral was olivine (peridot) but after soon realizing it wasn't, he concluded it was "dumortierite", a blue non-gem mineral, but later mineralogists at several Gemological Institutes have identified the new gem as a blue variety of the mineral zoisite. The Gemological Institute of America classifies tanzanite as a Type I gemstone, meaning it is normally eye-clean. Tanzanite is extremely rare,still found only in the Mererani Hills. It is noted for its remarkably strong trichroism, appearing alternately sapphire blue, violet and burgundy depending on crystal orientation.Tanzanite can also appear differently when viewed under alternate lighting conditions. The blues appear more evident when subjected to fluorescent light and the violet hues can be seen readily when viewed under incandescent illumination. Tanzanite is usually a reddish brown in its rough state, requiring artificial heat treatment to bring out the blue violet of the stone. Gems with eye-visible inclusions will be traded at deep discounts. Rarely, gem-quality tanzanite will heat to a green primary hue, most always accompanied by a blue or violet secondary hue. These green tanzanite have some meaningful value in the collector market, but are seldom of interest to commercial buyers.

In 2002, the American Gem Trade Association chose Tanzanite as a December birthstone, the first change to their birthstone list since 1912. From 1967 until the mines were nationalised by the Tanzanian Government in 1971, the estimated production was two million carats. In June 2003, the Tanzanian government introduced legislation banning the export of unprocessed tanzanite to India (like many gemstones, most tanzanite is cut in Jaipur). The ban has been rationalized as an attempt to spur development of local processing facilities, thereby boosting the economy and recouping profits. This ban was phased in over a two-year period, until which time only stones over 0.5 grams were affected.[citation needed] In 2010, the government of Tanzania banned the export of rough stones weighing more than one gram.

Tanzanite is believed to be reassuring and give you patience. It makes you think before talking. Is also considered good for eye discomfort and headaches.


CLARITY CLASSIFICATION
IF Internally Flawless No Inclusions Visible Even With 10x Magnification.
VVS Very-Very Slightly Included Minute Inclusions Not Visible To Eye.
VSI Very Slight Inclusions Slight Inclusions Visible To Eye.
SI 1-2 Slight Inclusions: Some Inclusions Visible.
I 1-3 Included Many Inclusions Visible. 807163324

 

 

 

 

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Latest update: 22 september 2015